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import unittest

import greedy_knapsack as kp

class TestClass(unittest.TestCase):

"""

Test cases for knapsack

"""

def test_sorted(self):

"""

kp.calc_profit takes the required argument (profit, weight, max_weight)

and returns whether the answer matches to the expected ones

"""

profit = [10, 20, 30, 40, 50, 60]

weight = [2, 4, 6, 8, 10, 12]

max_weight = 100

self.assertEqual(kp.calc_profit(profit, weight, max_weight), 210)

def test_negative_max_weight(self):

"""

Returns ValueError for any negative max_weight value

:return: ValueError

"""

# profit = [10, 20, 30, 40, 50, 60]

# weight = [2, 4, 6, 8, 10, 12]

# max_weight = -15

self.assertRaisesRegex(ValueError, "max_weight must greater than zero.")

def test_negative_profit_value(self):

"""

Returns ValueError for any negative profit value in the list

:return: ValueError

"""

# profit = [10, -20, 30, 40, 50, 60]

# weight = [2, 4, 6, 8, 10, 12]

# max_weight = 15

self.assertRaisesRegex(ValueError, "Weight can not be negative.")

def test_negative_weight_value(self):

"""

Returns ValueError for any negative weight value in the list

:return: ValueError

"""

# profit = [10, 20, 30, 40, 50, 60]

# weight = [2, -4, 6, -8, 10, 12]

# max_weight = 15

self.assertRaisesRegex(ValueError, "Profit can not be negative.")

def test_null_max_weight(self):

"""

Returns ValueError for any zero max_weight value

:return: ValueError

"""

# profit = [10, 20, 30, 40, 50, 60]

# weight = [2, 4, 6, 8, 10, 12]

# max_weight = null

self.assertRaisesRegex(ValueError, "max_weight must greater than zero.")

def test_unequal_list_length(self):

"""

Returns IndexError if length of lists (profit and weight) are unequal.

:return: IndexError

"""

# profit = [10, 20, 30, 40, 50]

# weight = [2, 4, 6, 8, 10, 12]

# max_weight = 100

self.assertRaisesRegex(

IndexError, "The length of profit and weight must be same."

)

if __name__ == "__main__":

unittest.main()

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